This is a movie I've watched several times and the same thing remains true every time I've seen it... I only ever remember 2 scenes (both of which you'll catch in any horror movie countdown). Try as I might (and I did again tonight), I can't retain any kind of attention for this movie. I find it dull, dull dull!!! Yes, I know, I know! Hitchcocks best film (bollox), a work of art (cough). I just don't like it.
I will happily concur with the fact that the films score by Bernard Herrman is outstanding. It is without doubt that the use of the soundtrack was what made the famous shower scene so effective (that's one of the scenes that I manage to retain). It sets a mood for the whole movie and manages to keep everyone perpetually on the edge of their seats, allowing for a few spectacular jumps.